JP4147126B2 - Oil filter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter device provided in an oil supply oil passage that supplies oil stored in a storage unit to an object to be lubricated by an oil pump.
[0002]
[Prior art]
FIG. 5 shows a hydraulic circuit diagram of a conventionally used engine lubrication apparatus. This lubrication apparatus includes oil supply oil passages L1a to L1c for supplying engine lubricating oil stored in an oil pan T to an engine E by an oil pump P, and oil used for lubricating the engine E as an oil pan T. And a return oil passage L3 for returning the oil to the tank, thereby circulating and supplying the oil.
[0003]
In the oil, dust such as metal powder or carbon generated by driving the engine E is mixed. For this reason, normally, two filters F and B are provided in the oil supply oil passages L1a to L1c as an oil filter device 1 ′ for filtering the dust (see, for example, Patent Document 1). .
[0004]
The first filter is a full flow filter F interposed in the oil supply oil passages L1a to L1c, and the filtered oil is directly sent to the engine E. The full-flow filter F has a coarse filter paper and can capture relatively large dust such as metal powder. In addition, a valve V ′ for opening and closing the oil supply paths L1b to L1c is provided in the downstream side portions L1b to L1c closest to the full flow filter F in the oil supply paths L1a to L1c. This valve V 'is for filling the full flow filter F with oil while the oil pump P is stopped to prevent insufficient oil supply at the start of the next pump operation. Therefore, the valve V 'operates so as to close the oil supply paths L1b to L1c when the oil pump P is stopped and open during operation.
[0005]
The second filter is a bypass filter B that is interposed in oil direct return oil passages L2a to L2b that branch from the oil supply oil passage L1a on the upstream side of the full flow filter F and return the oil directly to the oil pan T. is there. The oil filtered by the bypass filter B bypasses the engine E and is returned to the oil pan T. The filter paper of the bypass filter B is fine and can capture relatively small dust such as carbon.
[0006]
FIG. 6 shows a central longitudinal sectional view of the bypass filter B. In order to prevent the figure from becoming difficult to see, a part of the figure is shown in a side view, and a part of the sectional line is omitted. In FIG. 6, the vertical direction is indicated by arrows.
The bypass filter B includes an attachment member 11 for attaching the bypass filter B to the engine E, a substantially cylindrical filter case 21 erected integrally with an upper portion of the attachment member 11, and an upper end opening of the filter case 21 closed. A cap 31 that is disposed in the inner space of the filter case 21 to filter the oil, and is passed through the inner periphery of the filter element 41 to support the filter element 41 while supporting the filter element 41. And a center bolt 51 for fixing the filter case 21 to the filter case 21.
[0007]
Here, the filter element 41 defines an inner space of the filter case 21 into an outer space 21 a and an inner space 21 b of the filter element 41. In addition, an oil inlet hole 23a is provided in the cylindrical portion 23 of the filter case 21, whereby the outer peripheral space 21a is connected to the upstream portion L2a in the oil direct return oil passage. In addition, an oil outlet hole 25b is formed substantially at the center of the bottom 25 of the filter case 21, and the tip 51b of the center bolt 51 is screwed into the outlet hole 25b. An oil passage 51a that communicates the outlet hole 25b and the inner circumferential side space 21b is formed inside the center bolt 51, whereby the inner circumferential side space 21b is located downstream of the oil direct return oil passage. It is connected to the side portion L2b. Accordingly, the oil that has entered the bypass filter B from the inlet hole 23a is sequentially filtered through the outer peripheral space 21a, the filter element 41, the inner peripheral space 21b, and the center bolt 51, and then from the outlet hole 25b. It comes out and returns to the oil pan T.
[0008]
By the way, the filter element 41 used for the filtration is a consumable item and is periodically replaced. This replacement is performed by removing the cap 31 from the filter case 21. At this time, the oil in the filter case 21 may be scattered outside the case 21 as shown by a one-dot chain line in the figure. For this reason, so-called draining is performed in which the oil in the case 21 is drawn into the oil pan T in advance before the cap 31 is opened.
[0009]
However, at the time of draining, the oil in the inner peripheral space 21b is directly connected to the outlet hole 25b, and thus drains out without much resistance. However, the oil in the outer peripheral space 21a has a resistance to pass through the filter element 41. It takes a lot of time to pull out the oil pan T. For this reason, as one method for shortening this time, the center bolt 51 is loosened from the outlet hole 25b to form a gap between them, and the filter element 41 is bypassed by this gap to allow the oil in the outer peripheral space 21a to flow. Is quickly removed from the outlet hole 25b. The oil flow at this time is indicated by a broken-line arrow in the figure.
[0010]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-141011 (page 3, page 4, FIG. 2)
[0011]
[Problems to be solved by the invention]
However, even if it is shortened in this way, it seems that the time required for draining is long, and depending on the operator, the cap from the filter case 21 before the draining is completed due to the consciousness of shortening the filter element replacement time as much as possible. Accordingly, there is a possibility that the oil overflows from the upper end of the filter case 21 and flows out as shown by a one-dot chain line in the figure.
[0012]
Further, in order to shorten the time for draining itself, an improvement has been made such that a notch is provided in the tip 51b of the center bolt 51 to increase the drain flow rate when the center bolt 51 is loosened. There is a limit to shortening the time itself, and it is very difficult to shorten the filter element replacement time.
[0013]
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide an oil filter device that can reliably prevent oil from being scattered when the filter element is replaced and that can shorten the replacement time. To do.
[0014]
[Means for Solving the Problems]
  To achieve this goalThe present inventionA first filter provided in an oil supply oil passage that supplies oil stored in the storage portion to an object to be lubricated by an oil pump, and branches from the oil supply oil passage upstream of the first filter to the storage portion. An oil filter device comprising a second filter provided in an oil bounce oil path for boiling oil;
  In the second filter, a bypass oil passage that directly connects the upstream space defined by the filter element in the second filter to the storage portion is close to the oil supply oil passage on the downstream side of the first filter. A common valve body that opens and closes both the oil supply oil passage and the bypass oil passage is provided in the proximity portion, and when the oil pump is stopped, the valve body is Close the oil supply oil passage on the downstream side of one filter and move to the first position for opening the bypass oil passage of the second filter. During the operation of the oil pump, open the oil supply oil passage, Move to the second position to close the bypass oil passage;
  The oil supply oil passage in the adjacent portion is a hole, and the valve body is a spool that is movably fitted along the hole, and the spool moves to the second position so that the upstream hole and the downstream hole are downstream. When communicating with the side hole, a shunting hole for shunting the spool is branched along the upstream hole, and a part of the bypass oil passage is connected to the shunting hole. When the spool moves to the first position and shuts off the upstream hole and the downstream hole, the bypass oil passage blocked by the spool is communicated via the escape hole. RuIt is characterized by that.
[0015]
  According to the above invention, while the oil pump is stopped, the valve element moves to the first position, thereby opening the bypass oil passage. This bypass oil passage causes the upstream space defined by the filter element in the second filter to return directly to the storage section, and thereby quickly collects oil that tends to stay in the upstream space. To the storage part (hereinafter also referred to as draining). That is, this oil filter device automatically drains the upstream space of the second filter every time the oil pump is stopped. Accordingly, it is possible to reliably prevent the oil remaining in the upstream space from being scattered when the filter element of the second filter is removed.
  In addition, since the bypass oil passage is immediately opened immediately after the oil pump is stopped, the draining start time is accelerated, thereby leading to the completion of draining. Therefore, the filter element replacement time can be significantly shortened.
  Furthermore, since the valve body that opens and closes the oil supply oil passage of the first filter is also used as the valve body that opens and closes the bypass oil passage of the second filter, the number of parts of the oil filter device can be reduced and the manufacturing cost can be reduced. It can be kept low.
  According to the present invention, a configuration equivalent to the provision of a valve for opening and closing the bypass oil passage of the second filter can be obtained by simply connecting a midway portion of the bypass oil passage to the escape hole of the spool. Therefore, the manufacturing cost of the oil filter device can be kept low.
[0017]
  The present invention, in the oil filter device,
  The bypass oil passage communicates with a lower portion of the upstream space, and the storage portion is located below the bypass oil passage, and the valve body moves to the first position and the bypass oil passage When is opened, the oil staying in the upstream space flows down to the reservoir through the bypass oil passage.
  Further, the present invention provides a first filter provided in an oil supply oil passage that supplies oil stored in a storage portion to an object to be lubricated by an oil pump, and branches from the oil supply oil passage upstream of the first filter. And an oil filter device provided with a second filter provided in an oil bounce oil path for boiling the oil back to the storage part,
In the second filter, a bypass oil passage that directly connects the upstream space defined by the filter element in the second filter to the storage portion is close to the oil supply oil passage on the downstream side of the first filter. A common valve body that opens and closes both the oil supply oil passage and the bypass oil passage is provided in the proximity portion, and when the oil pump is stopped, the valve body is Close the oil supply oil passage on the downstream side of one filter and move to the first position for opening the bypass oil passage of the second filter. During the operation of the oil pump, open the oil supply oil passage, It is configured to move to a second position for closing the bypass oil passage,
  The bypass oil passage communicates with a lower portion of the upstream space, and the storage portion is located below the bypass oil passage, and the valve body moves to the first position and the bypass oil passage When is opened, the oil staying in the upstream space flows down to the reservoir through the bypass oil passage.
  According to the above invention, the bypass oil passage communicates with a lower portion of the upstream space, and the storage portion is located below the bypass oil passage. Therefore, the oil staying in the upstream space can be caused to flow down and drawn out to the storage portion, and oil scattering can be reliably prevented.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings.
=== Schematic Configuration of Oil Filter Device ===
FIG. 1 is a hydraulic circuit diagram of an engine lubricating device using an oil filter device according to an embodiment of the present invention. First, the schematic configuration and operation of the oil filter device will be described with reference to this figure.
[0019]
As shown in FIG. 1, the oil filter device 1 is a full flow provided in oil supply oil passages L1a to L1c that supply oil stored in an oil pan T as a storage portion to an engine E as a lubrication target by an oil pump P. A filter F and a bypass filter B provided in oil direct return oil passages L2a to L2b branched from the oil supply oil passages L1a to L1c on the upstream side of the full flow filter F and directing oil to the oil pan T I have. Note that the oil used for lubricating the engine E returns to the oil pan T through the return oil passage L3.
[0020]
In the bypass filter B, bypass oil passages LBa to LBb for directly passing the upstream space 21a defined by the filter element 41 in the bypass filter B to the oil pan T are provided on the downstream side of the full flow filter F. Provided close to the supply oil passages L1b to L1c, a common spool valve V for opening and closing both the oil supply oil passages L1b to L1c and the bypass oil passages LBa to LBb is provided in the proximity portion. .
[0021]
The spool, which is the valve body of the spool valve V, reciprocates between two positions. That is, when the oil pressure (hereinafter also referred to as primary pressure) of the upstream portion L1b of the spool valve V in the oil supply oil passage increases, the oil moves to the second position, and when the pressure decreases, the first force is generated by the elastic force of the coil spring. Return to position.
[0022]
As shown in FIG. 1, the first position is a position for closing the oil supply oil passages L1b to L1c on the downstream side of the full flow filter F and opening the bypass oil passages LBa to LBb of the second filter. On the contrary, the second position is a position for opening the oil supply oil passages L1b to L1c and closing the bypass oil passages LBa to LBb.
[0023]
During the stop of the oil pump P, the spool is returned to the first position by the coil spring, whereby the oil flow L1b to the full flow filter F is filled with oil in the filter F. L1c is closed, and for the bypass filter B, the oil passages LBa to LBb are opened so that the oil in the upstream space 21a of the filter B is drained to the oil pan T.
[0024]
On the contrary, during the operation of the oil pump P, the spool moves to the second position due to the oil pressure, thereby opening the oil passages L1b to L1c for the full flow filter F to the engine E. Oil is supplied, and for the bypass filter B, the bypass oil passages LBa to LBb are closed, the oil is passed through the filter element 41, and the oil filtered by the filter element 41 is passed through the oil direct return oil passage L2b. Return to pan T.
[0025]
According to such an oil filter device 1, every time the oil pump P is stopped, drainage of oil that tends to stay in the upstream space 21 a of the bypass filter B is automatically performed. Therefore, when the filter element 41 is removed from the bypass filter B, oil scattering in the upstream space 21a can be reliably prevented.
Further, since the bypass oil passages LBa to LBb are immediately opened immediately after the oil pump P is stopped, the start point of the drainage is advanced, and thereby the drainage completion time is advanced. Therefore, the filter element replacement time can be remarkably shortened.
Furthermore, since the valve body for opening and closing the bypass oil passages LBa to LBb of the bypass filter B is also used as the spool for opening and closing the oil supply oil passages L1b to L1c of the full flow filter F, the number of parts of the oil filter device 1 is reduced. The manufacturing cost can be kept low.
[0026]
=== Detailed Configuration of Oil Filter Device ===
Next, the configuration of the oil filter device 1 will be described in detail with reference to FIGS. FIG. 2 is a central longitudinal sectional view of the bypass filter B. FIG. 3 and 4 are central sectional views of the full flow filter F. FIG. 3 shows a state where the spool is in the first position, and FIG. 4 shows a state where the spool is in the second position. In addition, in order to prevent these figures from becoming difficult to see, a part thereof is shown in a side view and a part of cross-sectional lines are omitted. 2 to 4, the up and down directions are indicated by arrows.
[0027]
As shown in FIGS. 2 and 3, the oil filter device 1 includes a block-shaped mounting member 11 for mounting on the engine E and the like, and a bypass filter B formed integrally on the top of the mounting member 11. And a full flow filter F, which is also integrally formed upright on the upper part. The bypass filter B and the full flow filter F are disposed adjacent to each other, and the spool valve V is provided in the attachment member 11.
[0028]
And by attaching the attachment surface 11a on the attachment member 11 side to the attachment surface (not shown) on the engine E side, the oil passages L1a, L1c, LBb, L2b on the oil filter device 1 side correspond to this. The hydraulic circuit shown in FIG. 1 is formed by connecting to the oil passage on the engine E side.
[0029]
The oil filter device 1 referred to here is composed of manifold parts in a range indicated by a one-dot chain line in the hydraulic circuit diagram of FIG. 1, and other parts such as an oil pump P and an oil pan T are attached to the engine E side. is doing.
[0030]
--- (1) Mounting member ---
As shown in FIGS. 2 and 3, the attachment member 11 is a block body in which a plurality of holes as the oil passages L1a to L1c, L2a to L2b, and LBa to LBb are formed. And the left end surface 11a in the figure is the mounting surface for mounting to the engine E, and the hole of the oil passage that communicates with the engine E side faces the mounting surface 11a. The spool valve V described above is provided in a part of the oil passage L1b to L1c of the mounting member 11, which will be described later.
[0031]
--- (2) Bypass filter ---
A bypass filter B shown in FIG. 2 includes a substantially cylindrical filter case 21 integrally formed on the mounting member 11, a cap 31 that closes the upper end opening of the filter case 21, and an inner space of the filter case 21. A substantially cylindrical filter element 41 arranged to filter the oil, and a center bolt 51 that is passed through the inner peripheral side of the filter element 41 to support the filter element 41 and fix the cap 31 to the filter case 21. And.
[0032]
(2-a) Filter case
A filter case 21 (hereinafter referred to as a case) is integrally formed on the upper portion of the mounting member 11 in an inclined state in which the cylinder axis is slightly inclined from the vertical. An oil inlet hole 23 a is formed in the cylindrical portion 23, and an oil outlet hole 25 b is formed in the approximate center of the bottom portion 25. The inlet hole 23a communicates with an upstream portion L2a of the oil direct return oil path branched from the oil supply oil path L1a, and the oil pressure-fed and supplied by the oil pump P from the inlet hole 23a is contained in the bypass filter B. Is taken in. The outlet hole 25b communicates with the downstream portion L2b of the oil direct return oil passage, and the filtered oil is returned to the oil pan T from the outlet hole 25b. In addition, the front-end | tip part 51b of the said center bolt 51 is screwed by the inner peripheral surface of this exit hole 25b, ie, it functions also as a support part of the center bolt 51.
[0033]
The case 21 accommodates the cylindrical filter element 41, whereby the inner space of the case 21 is defined by an outer space 21 a and an inner space 21 b of the filter element 41. Of these, the outer peripheral space 21b communicates with the inlet hole 23a, and the outer peripheral space 21a is the upstream space 21a of the filter element 41 described above. On the other hand, the inner peripheral side space 21 b communicates with the outlet hole 25 b via an oil passage 51 a formed inside the center bolt 51, and the inner peripheral side space 21 b is a downstream side space of the filter element 41. 21b. In addition, the passage of oil in both the spaces 21a and 21b is completely isolated by bushes 46a and 46b, which will be described later, so as to be possible only by passing through the filter element 41.
[0034]
As shown in FIGS. 2 and 3, a drain hole 23 b is formed in the lower portion of the cylindrical portion 23 of the case 21 to connect the outer peripheral space 21 a to the bypass oil passages LBa to LBb. And the escape hole 71 of the spool valve V mentioned later is diverted in the middle of these bypass oil paths LBa-LBb. Accordingly, the bypass oil passages LBa to LBb are opened and closed by the movement of the spool 73 of the spool valve V. In other words, when the spool 73 comes out of the escape hole 71, the bypass oil passages LBa to LBb are communicated, so that the oil staying in the outer space 21a of the case 21 is immediately passed to the oil pan T without passing through the filter element 41. Can be pulled out. On the other hand, if the spool 73 is retracted in the retracting hole 71, the bypass oil passages LBa to LBb are blocked, so that the oil staying in the outer peripheral space 21 a cannot return to the oil pan T unless it passes through the filter element 41.
[0035]
The drain hole 23b and the bypass oil passages LBa to LBb are located below or below the upstream space 21a, respectively, and the oil pan T is located further below. Therefore, when the bypass oil passages LBa to LBb are opened, the oil in the upstream space 21a flows down the oil passages LBa to LBb by gravity and reaches the oil pan T, so that the oil in the upstream space 21a is surely removed. It is like that.
[0036]
(2-b) Cap
The cap 31 shown in FIG. 2 is a disk member having substantially the same planar shape as the upper end opening of the cylindrical portion 23 of the filter case 21. On the back surface of the cap 31, an annular convex portion 33 is formed so as to protrude slightly inward from the periphery. And this annular convex part 33 fits the inner peripheral surface of the said case cylinder part 23, and obstruct | occludes the upper end opening of the cylinder part 23. FIG. A seal ring (not shown) is interposed between the two.
[0037]
A through hole 31 a for the center bolt 51 is provided in the center portion of the cap 31. The cap 31 fitted to the case 21 has the head 51c of the center bolt 51 engaged with the through hole 31a, and the male screw of the tip 51b is screwed into the outlet hole 25b of the case bottom 25. It is fixed by wearing.
[0038]
(2-c) Filter element
The filter element 41 has a substantially cylindrical appearance, and mainly captures and filters carbon in the oil by passing the oil in a radial direction from the outer peripheral side to the inner peripheral side.
The filter element 41 has a substantially cylindrical frame 43 in which a large number of oil passage holes (not shown) are formed as main components, and is coaxially integrated with both ends of the frame 43 in the cylinder axis direction. And a pair of upper and lower circular end plates 45a and 45b fixed to each other, and an element main body 47 made of fold-folded filter paper disposed so as to cover the entire outer periphery of the frame 43.
[0039]
A circular hole is formed in each of the center portions of the pair of upper and lower end plates 45a and 45b. The center bolt 51 is passed through the circular holes via bushes 46a and 46b. The filter element 41 is supported. The bushes 46a and 46b are fitted into the center bolt 51 and the circular hole with no gap, that is, they are also sealing members that seal the gap between the two. A coil spring 61 is interposed between the upper bush 46a and the back surface of the cap 31, and the filter element 41 is pressed against the bottom 25 with a predetermined pressing force. 46b is in contact with the peripheral portion of the outlet hole 25b of the bottom portion 25.
[0040]
(2-d) Center bolt
In the center bolt 51, the oil passage 51a is formed along the axis. The oil passage 51a communicates the outer peripheral surface of the center bolt 51 and the tip, and the inner space 21b communicates with the outlet hole 25b through the oil passage 51a.
[0041]
--- (3) Full flow filter ---
The full flow filter F shown in FIG. 3 includes a substantially cylindrical filter case 121 integrally formed on the upper portion of the mounting member 11, a cap 131 that closes the upper end opening of the filter case 121, and an inner space of the filter case 121. A substantially cylindrical filter element 141 arranged to filter oil, and a center bolt 151 for fixing the cap 131 to the filter case 121 while passing through the inner peripheral side of the filter element 141 and supporting the filter element 141. And.
[0042]
(3-a) Filter case
The filter case 121 (hereinafter referred to as a case) is integrally formed on the upper portion of the mounting member 11 with the cylinder axis inclined slightly from the vertical. In the case 121, the substantially cylindrical filter element 141 is accommodated, whereby the inner space of the case 121 is defined by an outer space 121a and an inner space 121b of the filter element 141. . An oil inlet hole 123a is formed in the cylindrical portion 123 of the case 121, so that the outer peripheral space 121a communicates with the upstream portion L1a of the oil supply oil passage. An oil outlet hole 125b is formed in the bottom 125 of the case 121, so that the inner circumferential space 121b communicates with the outlet hole 125b via a circular hole in the lower end plate 145b described later. Yes.
[0043]
Accordingly, the oil pressure-fed and supplied to the full flow filter F by the oil pump P is sequentially filtered through the inlet hole 123a, the outer peripheral side space 121a, the filter element 141, and the inner peripheral side space 121b, and then the outlet hole 125b. To be sent to engine E.
[0044]
The oil supply oil passages L1b to L1c in the vicinity of the outlet hole 125b are provided with the spool valve V for opening and closing the oil passages L1b to L1c. The spool valve V will be described later.
[0045]
(3-b) Cap
The cap 131 is a disk member having substantially the same planar shape as the upper end opening of the cylindrical portion 123 of the filter case 121. On the back surface of the cap 131, an annular convex portion 133 is formed so as to protrude slightly inward from the periphery. And this annular convex part 133 fits the inner peripheral surface of the said case cylinder part 123, and obstruct | occludes the upper end opening of the cylinder part 123. FIG. A seal ring (not shown) is interposed between the two.
[0046]
A through hole 131 a of the center bolt 151 is provided in the center portion of the cap 131. The cap 131 fitted to the case 121 has the head 151c of the center bolt 151 engaged with the through hole 131a, and the male screw of the tip 151b is screwed to the center of the case bottom 125. It is fixed by.
[0047]
(3-c) Filter element
The filter element 141 has a substantially cylindrical appearance, and mainly captures and filters the metal powder in the oil by passing the oil in the radial direction from the outer peripheral side to the inner peripheral side.
The filter element 141 includes, as main components, a substantially cylindrical frame 143 in which a large number of oil passage holes (not shown) are formed, and a pair of upper and lower parts integrally fixed to both ends of the frame 143. Circular end plates 145a and 145b, and an element body 147 made of fold-folded filter paper, which is disposed so as to cover the entire outer periphery of the frame 143.
[0048]
A circular hole is formed in each of the circular center portions of the pair of upper and lower end plates 145a and 145b, and the center bolt 151 is passed through these circular holes. A bush 146a is interposed between the center bolt 151 and the circular hole of the upper end plate 145a, but is not interposed between the circular hole of the lower end plate 145b. Thus, there is a gap between the circular hole. The inner space 121b communicates with the outlet hole 125b through this gap. In correspondence with the outer portion of the circular hole of the lower end plate 145b, an annular portion 127 protrudes from the case bottom 125 and contacts the end plate 145b, whereby the outlet hole 125b and the outer peripheral space 121a is sealed. This contact is achieved by pressing the filter element 141 toward the bottom 125 with a predetermined pressing force by a coil spring 161 interposed between the bush 146a and the back surface of the cap 131.
[0049]
--- (4) Spool valve ---
The spool valve V shown in FIG. 3 is provided in the oil supply oil passages L1b to L1c communicating in close proximity to the outlet hole 125b of the full flow filter F. The main purpose of the spool valve V is to fill the full flow filter F with the oil pump P stopped while the oil pump P is stopped, as described above, to prevent insufficient oil supply at the start of the next operation. . For this reason, the spool 73 of the spool valve V moves in the oil passage L1b so as to close the oil supply passages L1b to L1c when the oil pump P is stopped and open during operation. However, in the present invention, the spool valve V also functions as a drain valve for draining oil remaining in the upstream space 21a of the bypass filter B shown in FIG.
[0050]
The oil supply oil passages L1b to L1c in which the spool valve V is provided are bent like a letter as shown in FIG. That is, it is composed of a portion L1b extending in the diagonally downward left direction in the drawing from the outlet hole 125b and a portion L1c extending in the left horizontal direction at the bent portion. Then, in order to allow the spool 73 to move along the oil passage L1b upstream of the bent portion, a retracting hole 71 of the spool 73 is formed in the bent portion in the diagonally downward left direction along the oil passage L1b. Branched and formed. When the spool 73 is positioned at the bent portion as shown in FIG. 3, the oil supply oil passages L1b to L1c are blocked, and when the spool 73 is located at the retracting hole 71 as shown in FIG. 4, the oil supply oil passages L1b to L1c are It comes to communicate. That is, the first position described above corresponds to the position of the bent portion, and the second position corresponds to the position of the escape hole 71.
[0051]
Further, the escape hole 71 constitutes a part of the bypass oil passages LBa to LBb of the bypass filter B. That is, as shown in FIG. 3, an inlet hole 71a communicating with the bypass oil passage LBa is formed in the upper portion of the escape hole 71, and an outlet hole 71b communicating with the bypass oil passage LBb is formed in the lower portion of the escape hole 71. Is formed. Accordingly, as shown in the figure, when the spool 73 comes out of the retracting hole 71 and is positioned at the first position, the bypass oil passages LBa to LBb are communicated, and thereby the outer peripheral side of the bypass filter B shown in FIG. The oil staying in the space 21 a can be extracted to the oil pan T without passing through the filter element 41 of the bypass filter B. On the other hand, as shown in FIG. 4, when the spool 73 is retracted in the retracting hole 71 and is positioned at the second position, the bypass oil passages LBa to LBb are blocked, and thus stay in the outer space 21 a shown in FIG. The oil to be returned cannot be returned to the oil pan T unless it passes through the filter element 41.
[0052]
In addition, the drain valve of the bypass oil passages LBa to LBb has a configuration in which a midway portion of the bypass oil passages LBa to LBb is simply connected to the escape hole 71, and it is not necessary to provide a separate valve body or the like. Therefore, the manufacturing cost of the oil filter device 1 can be kept low.
[0053]
The spool 73 that performs such an operation is a covered cylindrical body, and is slidably fitted along the oil passage L1b and the escape hole 71. And the coil spring 75 is provided in the escape hole 71 side which is the back surface side of the cover part of this spool 73, and the elastic force is provided to the upstream of the oil path L1b. Therefore, in the natural state where no external force is applied as shown in FIG. 3, the spool valve 73 is located at the first position, which is the bent portion, thereby closing the oil supply oil passages L1b to L1c and bypass oil. Open the roads LBa to LBb. On the other hand, during the operation of the oil pump P, the primary pressure, which is the oil pressure in the oil passage L1b upstream of the spool 73, acts on the spool 73 as the external force, so the spool 73 is pushed into the escape hole 71, This opens the oil supply oil passages L1b to L1c and closes the bypass oil passages LBa to LBb.
[0054]
=== Automatic drain removal when replacing the filter element of the bypass filter ===
Here, automatic drain removal when the filter element 41 of the bypass filter B is replaced will be described with reference to FIGS.
During operation of the engine E, the oil pump P is also operated in conjunction with this. For this reason, as shown in FIG. 4, the primary pressure of the oil of the spool valve V is high, and the spool 73 is pushed into the escape hole 71 and is positioned at the first position. Therefore, the oil supply oil passages L1b to L1c of the full flow filter F are open and supply oil to the engine E. On the other hand, the bypass oil passages LBa to LBb of the bypass filter B are closed, and the oil that has entered the bypass filter B shown in FIG. 2 is filtered through the filter element 41 and then exits from the outlet hole 25b to the oil pan T. Returned to.
[0055]
Here, when the engine E is stopped, the oil pump P is also stopped in conjunction with this. Then, the primary pressure of the spool valve V decreases, and the spool 73 moves from the escape hole 71 to the second position, which is a bent portion, as shown in FIG. As a result, the oil supply oil passages L1b to L1c of the full flow filter F are closed, and the oil is contained and filled in the full flow filter F. On the other hand, since the bypass oil passages LBa to LBb of the bypass filter B are opened, the oil in the outer peripheral side space 21a of the bypass filter B shown in FIG. 2 quickly escapes to the oil pan T through the bypass oil passages LBa to LBb. Thus, drainage is automatically performed.
Since draining starts at the same time as the stop of the oil pump P, the draining completion time is also shortened accordingly, and the replacement time of the filter element 41 can be shortened.
[0056]
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible in the range which does not deviate from the summary.
In the present embodiment, the spool 73 is exemplified as the common valve body that opens and closes both the oil supply oil passages L1a to L1c and the bypass oil passages LBa to LBb. However, the present invention is not limited to this.
In the present embodiment, the bypass oil passage LBa of the bypass filter B has a bent portion, but is not limited thereto. For example, if it is possible to position the inlet hole 71a formed in the withdrawal hole 71 of the spool valve V in the horizontal direction side of the drain hole 23b of the outer peripheral side space 21a of the bypass filter B, these holes 23b, 71a The bypass oil passage LBa connecting the two can be constituted by a single straight horizontal hole. In this case, oil passage formation is facilitated.
[0057]
【The invention's effect】
As described above, according to the present invention, it is possible to provide an oil filter device that can reliably prevent oil from being scattered at the time of filter element replacement and can shorten the replacement time.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram of an engine lubricating device using an oil filter device according to an embodiment of the present invention.
FIG. 2 is a central longitudinal sectional view of a bypass filter of the oil filter device according to the present embodiment.
FIG. 3 is a central longitudinal sectional view of a full flow filter of an oil filter device according to the present embodiment.
FIG. 4 is a central longitudinal sectional view of a full flow filter of an oil filter device according to the present embodiment.
FIG. 5 is a hydraulic circuit diagram of an engine lubrication device using a conventional oil filter device.
FIG. 6 is a central longitudinal sectional view of a conventional bypass filter.
[Explanation of symbols]
B Bypass filter, second filter
E Engine, lubrication target
F Full flow filter, 1st filter
L1a, L1b, L1c Oil supply oil passage
L2a, L2b Oil bounce oil path
LBa, LBb Bypass oil passage
L3 Return oil passage
P Oil pump
T reservoir, oil pan
V spool valve
21a Bypass filter outer space, upstream space
41 Filter element of bypass filter
71 Retreat hole
73 Spool, valve disc

Claims (3)

A first filter provided in an oil supply oil passage that supplies oil stored in the storage portion to an object to be lubricated by an oil pump, and branches from the oil supply oil passage upstream of the first filter to the storage portion. An oil filter device comprising a second filter provided in an oil bounce oil path for boiling oil;
In the second filter, a bypass oil passage that directly connects the upstream space defined by the filter element in the second filter to the storage portion is close to the oil supply oil passage on the downstream side of the first filter. A common valve body that opens and closes both the oil supply oil passage and the bypass oil passage is provided in the proximity portion, and when the oil pump is stopped, the valve body is Close the oil supply oil passage on the downstream side of one filter and move to the first position for opening the bypass oil passage of the second filter. During the operation of the oil pump, open the oil supply oil passage, Move to the second position to close the bypass oil passage;
The oil supply oil passage in the adjacent portion is a hole, and the valve body is a spool that is movably fitted along the hole, and the spool moves to the second position so that the upstream hole and the downstream hole are downstream. When communicating with the side hole, a shunting hole for shunting the spool is branched along the upstream hole, and a part of the bypass oil passage is connected to the shunting hole. When the spool moves to the first position and shuts off the upstream hole and the downstream hole, the bypass oil passage blocked by the spool is communicated via the escape hole. oil filter and wherein the that. The oil filter device according to claim 1 ,
The bypass oil passage communicates with a lower portion of the upstream space, and the storage portion is located below the bypass oil passage, and the valve body moves to the first position and the bypass oil passage When the oil is opened, the oil staying in the upstream space flows down to the storage section through the bypass oil passage . A first filter provided in an oil supply oil passage that supplies oil stored in the storage portion to an object to be lubricated by an oil pump, and branches from the oil supply oil passage upstream of the first filter to the storage portion. An oil filter device comprising a second filter provided in an oil bounce oil path for boiling oil;
In the second filter, a bypass oil passage that directly connects the upstream space defined by the filter element in the second filter to the storage portion is close to the oil supply oil passage on the downstream side of the first filter. A common valve body that opens and closes both the oil supply oil passage and the bypass oil passage is provided in the proximity portion, and when the oil pump is stopped, the valve body is Close the oil supply oil passage on the downstream side of one filter and move to the first position for opening the bypass oil passage of the second filter. During the operation of the oil pump, open the oil supply oil passage, Move to the second position to close the bypass oil passage;
The bypass oil passage communicates with a lower portion of the upstream space, and the storage portion is located below the bypass oil passage, and the valve body moves to the first position and the bypass oil passage When the oil is opened, the oil staying in the upstream space flows down to the storage section through the bypass oil passage .

Images